package cn.tedu.fallback;

import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class ItemFallback implements FallbackProvider {


    /**
     * 返回一个服务的id,表示当前降级类是针对把个服务器的降级
     * @return
     */
    @Override
    public String getRoute() {
        return "item-service";
        //return "*";//针对所有服务都应用当前降级类
        //return null; //针对所有服务都应用当前降级类
    }

    /**
     * 想客户端发回的降级响应,封装到response对象
     * @param route
     * @param cause
     * @return
     */
    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {

        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.OK;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.OK.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.OK.getReasonPhrase();
            }

            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
                String json = JsonResult.err().msg("调用商品失败!").toString();

                return new ByteArrayInputStream(json.getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
                 HttpHeaders h = new HttpHeaders();
                 h.setContentType(MediaType.APPLICATION_JSON);
                 return h;
            }
        };
    }
}
